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Description automatically generated with medium confidenceRuth Britto

Associate Professor in Theoretical Physics

Fellow of Trinity College Dublin


School of Mathematics

Trinity College

Dublin 2



+353 1 896 3945



2022-23: On sabbatical leave at the Institute for Advanced Study (Princeton, USA).



Scattering amplitudes play a key role in high-energy physics. Not only do they describe the actual scattering taking place in collider experiments--of current importance in the era of the Large Hadron Collider (LHC)--but they also illuminate the formal aspects of quantum field theories, such as divergent behavior or integrability. Amplitudes are thus useful both practically and formally, but their availability is limited by the difficulty of computing them.

As the number of particles in the scattering process increases, or the perturbative expansion is carried out to higher order, the traditional technique of Feynman rules fails to be feasibly implementable. This difficulty has prompted the innovation of new techniques. Notable among these are on-shell techniques, in which the basic building blocks are complete amplitudes, rather than fundamental interactions. The on-shell framework has surpassed traditional Feynman diagram expansions, both in delivering new results and in expressing them in formulas that are not only compact, but also deeply illuminating. My research develops the on-shell framework to incorporate all theories and configurations of physical interest, building upon recent developments in pure mathematics.


Innovative Training Network Scattering Amplitudes: from Geometry to Experiment [SAGEX]

2018-2022. A network of eight European beneficiary institutions hosting 15 PhD students in the field of scattering amplitudes, in cooperation with international partners from academia and industry.



Full list of publications on INSPIRE

Lecture notes: Constructing scattering amplitudes

Review articles:

·       Mathematical structures in Feynman integrals, with S. Abreu and C. Duhr. (Chapter 3 of The SAGEX Review on Scattering Amplitudes)

·       Loop amplitudes in gauge theories: modern analytic approaches